I would like to figure out how to use in correct mode the humidity settings -snip-
If unsure use/keep the 0.5 default value.
The humidity-setting might be interesting in regard to accuracy tests (esp. sub zero).
It's also a nice example how any of the internal registry values can be manipulated from the menu!
The new condensation-settings (aka. alarm1) do this:
Ambient rel. humidity should be measured using some gauge/tool, then set in the camera.
Then the TIC can
calculate the dew-point for the current temperature(reflected temp setting i guess)+rel. humidity pair.
The last setting allows to tell the dewpoint-formula to calculate for a different value - as mold might grow above ~70% rel. hum.
Basically the whole condensation mode is a bit gimmiky as a simple dewpoint-table and an educated user could just set up "blue below" some temperature and get the same results - but it's green palette fits the psychology and the built in dewpoint formula might be handy.
I strongly suggest reading the MANUAL (pdf) - there's a nice appendix - and Flir has put online some nice information for different use cases.